WO2002045292A1 - Power change estimation for communication system - Google Patents
Power change estimation for communication system Download PDFInfo
- Publication number
- WO2002045292A1 WO2002045292A1 PCT/EP2001/013748 EP0113748W WO0245292A1 WO 2002045292 A1 WO2002045292 A1 WO 2002045292A1 EP 0113748 W EP0113748 W EP 0113748W WO 0245292 A1 WO0245292 A1 WO 0245292A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- change
- power
- loading
- communication system
- link
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
Definitions
- the present invention relates to a technique for providing an estimate of the power change in a corr-munication system responsive to a change in the load in the system, and particularly to a mobile communication system, and particularly but not exclusively to a power increase.
- W-CDMA wide-band code division multiple access
- PIE Up-link power increase estimation
- Admission control allows a new user into the radio access network (RAN) if the admission does not cause an excessive interference in the system.
- RAN radio access network
- an admission control algorithm estimates the increase in the total interference level due to a new user. This is achieved by using an up-link power mcrease estimation method.
- the packet scheduler allocates up-link packet bit rates to data users by also using the uplink power increase estimation method.
- the packet scheduler estimates by how much the requested/allocated bit rates will increase the noise/interference level. Typically this estimation is also done using a power increase estimation method.
- the degree of resource usage in the cell is thus measured with the total received power in the up-link and with the total transmission power in the down-link, which both have particular limits that specify their full usage, hi order to distribute system capacity to users optimally, the consumption of each user should be predicted as well as possible prior to the actual admission in the use of capacity.
- the mapping of call configuration to the signal power depends on diverse factors that change in time.
- the power increase estimation methods currently used involve a fixed mathematical formula which is an approximation of the true physical behaviour. As a result of this approximation, the fixed formula provides an error margin in its estimation.
- the present invention provides a method of predicting a change in power requirements in the air interface in a communication system, comprising: estimating a new power level based on a proposed change in loading; implementing the change in loading; measuring a power level following implementation of the change; deterrmning an error between the estimated and measured power levels; and adapting the estimation step based on the determined error.
- the change in power requirements may be due to a change in up-link received interference.
- the change in power requirements may be due to a change in down-link transmission power.
- the proposed change in loading may be due to the admission of a new user.
- the proposed change in loading may be due to the allocation of a new data rate to a packet- switched user.
- the power requirements may be determined by the total received power in the up-link and the total transmitted power in the down-link.
- the total received power n the up-link may be determined by any one of the total interference in the cell, the noise floor, the user data rate, the rate of change of the user data rate, or the Eb/Io level of the service.
- the total transmitted power in the down-link may determined by any one of the total transmission power in the cell, the user data rate, the rate of change of the user data rate, or the required Eb/Io level of service.
- the step of estimating the new power level may utilise a neural network.
- the step of estimating the new power level may utilise a linear estimator.
- the present invention provides a control means for determining a change in power requirements in the air interface of a communication system, comprising: mean for estimating a new power level based on a proposed change in loading; means for implementing the change in loading; means for measuring a power level following implementation of the change; means for determining an error between the estimated and measured power levels; and means for adapting the estimation step based on the determined error.
- the means for estimating a new power level may comprise a power increase estimator.
- the means for implementing the change in loading may comprise a packet scheduler.
- the means for measuring a power level may comprise a load controller.
- the power increase estimator may further comprise the means for determining the error.
- the present invention provides a controller for determining a change in power requirements in the air interface of a communication system, comprising: a power increase estimator for estimating a new power level based on a proposed change in loading; a packet scheduler for implementing the change in loading; and a load controller for measuring a power level following implementation of the change; wherein the power increase estimator further determines an error between the estimated and measured power levels, and adapts the estimated based on the dete ⁇ nined error.
- control means for deterr-rining method a change in power requirements in the air interface of a communication system comprising: mean for estimating a new power level based on a proposed change in loading; means for implementing the change in loading; means for measuring a power level following implementation of the change; means for determining an error between the estimated and measured power levels; and means for adapting the estimation step based on the determined error.
- the control means may be provided in a radio network controller of a W-CDMA communication system.
- the invention provides a technique for estimating the change in up-link received interference or down-link transmission power for any anticipated change in cell loading.
- the cell load change may be, for example, due to the admission of new user or the allocation of data rates to packet switched users.
- the invention advantageously provides the radio resource management logic of the radio network controller with efficient means to distribute available radio resource. As a result, the invention provides improved call quality, improved system stability, and higher throughput with lower system interference.
- Figure 1 is a block diagram of an example W-CDMA system
- FIG. 2 is a block diagram of the functional elements of a radio network controller for implementing an embodiment of the invention. Description of Preferred Embodiments :
- BTS base transceiver stations
- UE user equipment
- NMS network management system
- the power increase estimation method in accordance with the present invention is implemented in the radio network controller 4 of Figure 1.
- FIG 2 there is illustrated the functional blocks of the radio network controller necessary for implementing the present invention. It will be appreciated that the radio network controller also comprises further functional blocks necessary for its operation, but which are not relevant to the present invention.
- a packet scheduler 10 a load control block 12 and a power increase estimator 14.
- the load control block receives on line 16 load measurements from the base transceiver stations 6 with which it is associated.
- the load control block determines the current load by measuring the measurements received from the base transceiver stations.
- the packet scheduler allocates bit rates or data rates to new users admitted to the part of the network associated with the radio network controller, and also re-allocates bit rates to existing users in accordance with changes in the network load, for example due to users leaving the network.
- the power increase estimator estimates, in accordance with the present invention, a change in the network load due to changes in allocated bit rates made by the packet scheduler.
- the packet scheduler 10 Responsive to a change in network load caused by, for example, a new user entering the network, the packet scheduler 10 re-allocates the bit rates for existing new users and allocates a bit rate to the new user.
- the packet scheduler then provides these up-link and down-link bit rates as proposed bit rates or candidate bit rates on line 20 to the power increase estimator (PIE).
- PIE power increase estimator
- the power increase estimator 14 using these candidate bit rates, calculates an estimate of both the total received up-link interference, and the total transmitted down-link power. These estimates are made in the power increase estimator using known fixed formula for making such estimations, in accordance with the prior art.
- Such known fixed functions provide a power estimate as a function of measured parameters and configuration parameters.
- these parameters may include: the total interference power in the cell; the noise floor; the user data rate; the rate of change of the user data rate; and the required Eb/Io level of service.
- these parameters may include: the total transmission power in the cell; the user data rate; the rate of change of the user data rate; and the required Eb/Io level of service.
- the power increase estimator then provides these estimated values on line 22 to the packet scheduler 10. The packet scheduler compares these estimated values to stored threshold values.
- the packet scheduler may allocate increased bit-rate values in the up-link or the down-link and provide these to the power increase estimator 14 as candidate values on line 20. If responsive thereto the packet scheduler determines that the estimated values on line 22 exceed the threshold values, the packet scheduler reverts to its previous candidate values and selects them as the allocated up-link and down-link bit rates.
- the allocated uplink and down-link bit rates are transmitted to the base transceiver stations and the user equipment in the network by the radio network controller by mean well-known in the art and not illustrated in Figure 2.
- the packet scheduler 10 provides the allocated up-link and down-link bit rates on line 24 to the power increase estimator 14.
- the power increase estimator receives on line 18 from the load control block 12 the actual total received interference and the actual total transmission power for the network. These are the actual values detected after the change in bit rates determined by the packet scheduler 10 have been implemented.
- the power increase estimator provides a revised estimation on line 22 to the packet scheduler 22 based on the actual change in power levels. Responsive to the revised estimate, the process of re-allocating bit rates may be repeated, possibly resulting in increased bit rates being allocated and the efficiency of the system thereby being improved.
- the power estimation function in accordance with the present invention is parameterised such that its specific definition can be adapted in time in order to rninimise the error between the predicted and he realised powers.
- the adaptation is performed continuously in order to respond to changing conditions in the cell.
- the technique according to the present invention can adapt to diverse conditions in the air interface. This provides the radio resource logic in the radio network controller with efficient means to distribute the available radio resource. This also facilitates improved radio network plarming.
- Prx, totai(&) The averaged estimate of the total received uplink interference in watts.
- Ri is the allocated bit rate (from the PS)
- Ei is the required bit- energy-to-interference-density ratio (cell parameter)
- the radio resource management unit provides the adaptation algorithm, located in the radio network controller, with the values above. If a packet allocation was made at time instant k— 1, the adaptation algorithm is executed at time instant k as follows:
- the power change prediction is made.
- the adaptation algorithm provides the packet scheduler with the up-link and down-link slope estimates CUL(k) and CDL( ⁇ ). For a prospective change in the packet load ⁇ J , the packet scheduler can predict the ensuing received interference or total transmission power with the following formulas:
- Prx, total(£ + 1) Prx, tohl(/V) ⁇ (uplink)
- the packet scheduler can consider the allocation of a higher load.
- a multi-layer perception neural network could implement the estimation function.
- the inputs to such a neural network could be any one of the measured power, the data rate, the change of data rate, and the required Eb/Io level.
- the network output may be the estimate for the new power level that is used, for instance, in admission control or packet scheduling. After the admission, the realised power may be measured.
- the network is then adapted, in accordance with the present invention, according to the difference between the predicted and realised powers to reduce error.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01985341A EP1338099A1 (en) | 2000-11-28 | 2001-11-23 | Power change estimation for communication system |
AU2002234528A AU2002234528A1 (en) | 2000-11-28 | 2001-11-23 | Power change estimation for communication system |
US10/432,226 US7738412B2 (en) | 2000-11-28 | 2001-11-23 | Power change estimation for communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0029003A GB2371712B (en) | 2000-11-28 | 2000-11-28 | Power change estimation for communication system |
GB0029003.1 | 2000-11-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002045292A1 true WO2002045292A1 (en) | 2002-06-06 |
WO2002045292A9 WO2002045292A9 (en) | 2002-09-19 |
Family
ID=9904030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/013748 WO2002045292A1 (en) | 2000-11-28 | 2001-11-23 | Power change estimation for communication system |
Country Status (6)
Country | Link |
---|---|
US (1) | US7738412B2 (en) |
EP (1) | EP1338099A1 (en) |
CN (1) | CN100546212C (en) |
AU (1) | AU2002234528A1 (en) |
GB (1) | GB2371712B (en) |
WO (1) | WO2002045292A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003088520A1 (en) * | 2002-04-08 | 2003-10-23 | Motorola, Inc. | System and method for predictive transmit power control for mobile stations in a multiple access wireless communication system |
WO2011095687A1 (en) * | 2010-02-05 | 2011-08-11 | Nokia Corporation | Methods, apparatuses and computer program products for performing load balancing |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004034680A1 (en) * | 2002-10-07 | 2004-04-22 | Interdigital Technology Corporation | System and method for simulation of performance of measurement-based algorithms for slotted wireless communications |
AU2002340984A1 (en) * | 2002-11-07 | 2004-06-07 | Nokia Corporation | Data transmission method involving estimation of cell power increase in the current and neighbouring cells due to a capacity request |
US7949342B2 (en) * | 2004-01-08 | 2011-05-24 | Interdigital Technology Corporation | Radio resource management in wireless local area networks |
WO2007066319A1 (en) | 2005-12-08 | 2007-06-14 | Mentor Graphics Corporation | Conversion of switching signals of a circuit simulation into a transaction model |
EP2074748B1 (en) * | 2006-10-03 | 2015-04-01 | Telefonaktiebolaget LM Ericsson (publ) | Method and radio network node in a telecommunication system |
MX2009006379A (en) * | 2007-02-05 | 2009-06-26 | Ericsson Telefon Ab L M | Load estimation using scheduled uplink power. |
CA2687240C (en) * | 2007-05-22 | 2017-06-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Load estimation in receiver diversity telecommunication systems |
WO2009025595A1 (en) | 2007-08-20 | 2009-02-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Supervision of faults in a receiver chain based on noise floor monitoring |
JP5669664B2 (en) * | 2011-05-16 | 2015-02-12 | 京セラ株式会社 | Radio base station and communication control method |
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US5886988A (en) * | 1996-10-23 | 1999-03-23 | Arraycomm, Inc. | Channel assignment and call admission control for spatial division multiple access communication systems |
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WO2000051390A1 (en) * | 1999-02-22 | 2000-08-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobile radio system and a method for channel allocation in a mobile radio system |
Family Cites Families (6)
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FR2595889B1 (en) * | 1986-03-14 | 1988-05-06 | Havel Christophe | TRANSMISSION POWER CONTROL DEVICE IN A RADIO COMMUNICATION TRANSCEIVER STATION |
US5305468A (en) * | 1992-03-18 | 1994-04-19 | Motorola, Inc. | Power control method for use in a communication system |
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JP2000276460A (en) * | 1999-03-24 | 2000-10-06 | Fuji Electric Co Ltd | Electric power demand predicting method |
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US6745044B1 (en) * | 2000-09-29 | 2004-06-01 | Qualcomm Incorporated | Method and apparatus for determining available transmit power in a wireless communication system |
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2000
- 2000-11-28 GB GB0029003A patent/GB2371712B/en not_active Expired - Fee Related
-
2001
- 2001-11-23 CN CNB018207553A patent/CN100546212C/en not_active Expired - Fee Related
- 2001-11-23 EP EP01985341A patent/EP1338099A1/en not_active Withdrawn
- 2001-11-23 US US10/432,226 patent/US7738412B2/en not_active Expired - Fee Related
- 2001-11-23 WO PCT/EP2001/013748 patent/WO2002045292A1/en not_active Application Discontinuation
- 2001-11-23 AU AU2002234528A patent/AU2002234528A1/en not_active Abandoned
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US6047189A (en) * | 1996-10-11 | 2000-04-04 | Arraycomm, Inc. | Adaptive method for channel assignment in a cellular communication system |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003088520A1 (en) * | 2002-04-08 | 2003-10-23 | Motorola, Inc. | System and method for predictive transmit power control for mobile stations in a multiple access wireless communication system |
US6876868B2 (en) | 2002-04-08 | 2005-04-05 | Motorola, Inc. | System and method for predictive transmit power control for mobile stations in a multiple access wireless communication system |
WO2011095687A1 (en) * | 2010-02-05 | 2011-08-11 | Nokia Corporation | Methods, apparatuses and computer program products for performing load balancing |
Also Published As
Publication number | Publication date |
---|---|
CN1531784A (en) | 2004-09-22 |
EP1338099A1 (en) | 2003-08-27 |
AU2002234528A1 (en) | 2002-06-11 |
GB0029003D0 (en) | 2001-01-10 |
GB2371712A (en) | 2002-07-31 |
GB2371712B (en) | 2004-09-29 |
CN100546212C (en) | 2009-09-30 |
WO2002045292A9 (en) | 2002-09-19 |
US20040063434A1 (en) | 2004-04-01 |
US7738412B2 (en) | 2010-06-15 |
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